When I close my ds during a game, instead of having the hardware and screens turn off and have the green light slowly blink, the ds keeps going back and forth into sleep, with the screens turning on and off each second like a flickering light. I can hear the noise that the ds makes when it comes out of sleep mode each time this happens. Does anyone know what's wrong or how to fix it? I dont think I can send it to nintendo as it's out of warranty.